Power saw for felling and cutting pulpwood



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POWER SAW FOR FELLING AND CUTTING PULPWOOD Filed Dec-. 51, 1945 2Sheets-Sheet 1 IN VEN TOR.

June 19, 1945. JflRWlN, JR 2,378,554

POWER SAW FOR FELLING AND CUTTING PULPWOOD INVENTOR.

A TTORNEV tree will fall when cut.

Patented June 19, 1.945

UNITED STATES AT.E TI&* FF

POWER SAW FOR FELLING- AND CUTTING PULPwoon John Irwin, Jr., New York;N.Y." Application December 31, 19 13, seen No. 5l(i,325

3 Claims. (01. 14343) This invention relates to new and usefulimprovements in .a .power'saw for felling and cutting pulpwood,timber,lumber, etc.

Morespecifically, the invention proposes the construction of apower sawfor felling and cutting pulp wood, etc.,- characterized by a frameprovided with wheels permitting the frame to be rolled over the groundand provided with a clamp and, a saw arranged in a manner to permit aclamp to be engaged about the trunk of a tree to be cut with a means fordriving the saw to out the tree at a slight distance above the clamp.

A further object of the invention propose the provision of a slidemovably mounted on the frame and having the saw rotatively mountedthereon with the provision of a gasoline motor on the slide arranged ina manner to drive the slide. A further object of the invention proposesthe provision of a novel means arrangedbetweenthe frame and slide in amanner to urge the slide towards'the tree to move the saw into the outbeing formed thereby.

Still another object of the invention proposes forming the frame ofseparate sections pivotally connectedtogether with the saw being mountedon the other section in a manner to permit; the angular position of thesaw to beadjusted with relation to the clamp to form an angular cut inthe tree and control the/direction inwhich the For further comprehensionof the invention, and of theobjects and'advantages thereof, referencewill be had to the following description and accompanying drawings, andto the appended claims in which the various novel features of theinvention are more particularly set forth.

In the accompanying drawings forming a material part of this invention:I

Fig. 1 is 'a front elevational view of a power saw constructed inaccordance with this invention. I f

Fig. 2 is a side elevational view of Fig. 1.

, Fig. 3 is an enlarged partial vertical sectional view taken on theline 3 -73v of Fig. 1.

Fig. 4 is a view similar to Fig. 1 but illustrating a modification ofthe invention.

Fig.5 is ,a partial side elevational view in the direction of the' line5-5 of Fig. 4.

The power sawfor felling and cutting pulpwood, according to thisinvention, includes a frame ID of U-shape and having wheels llrotativelymounted upon the free ends of the arms thereof. The side arms'oftheframe ID are provided with handle l2 which are adapted to bemanually gripped for'rolling the frame I over the ground upon the wheelsI I.

A clamp is mounted upon the front end of the looking frame I0 forengaging about the trunk of a tree to be cut. This clamp comprises apair of opposed jaws I4 pivotally supported upon arms I extendingalonggthe side arms of the frame II]. The armsv I5 arepivotallysupported intermediate of their ends upon pins I3 which pass througharms on one of the sections while the clamp is mounted I5- and engagetheside arm of the frame I0.

extended .from pistons I9 mounted within. a

' hydraulic cylinder IBM Springs [9 are mounted within the hydrauliccylinder I9 'and are arranged in'a mannerto urge the piston I9 into aretracted position within the cylinder I9 to pivot the arms I5 to spreadthe jaws I4 and permit a tree trunk to be engaged in position betweenthese'jaws. Hydraulic means which will be hereinafter considered, isprovided for spreading the pistons l3 within the hydraulic cylinder I9to close the jaws I4 securely in position upon diametrically oppositesides'of the tree trunk.

A slide 20 is movably mounted on the frame I 0 to move towards the treeengaged by the clamp Id. The slide 20 has its side edges slidablysupportedin grooves 2I cut in the side arms of the frame 10. slide 20are provided with Wheels I3 rotatively supported on. pins I4 and whichengage the grooves 2|. H v

A gasoline engine 22 is mounted upon the back of the slide 20 and has anextended driven shaft tree.

A hydraulic means is provided for urging the slide 20 towards the clamp.This means comprises a hydraulic cylinder 28 mounted upon theintermediate arm of the u-shaped frame In and which slidably encloses apiston 29 which is extended from the cylinder 28 and which is attachedto the rear portion of the slide 20. A tank 30 for hydraulic fluid ismountedon the slide 20 and connected with a fluid pump 3| also mountedon the slide 20 by means of a p pe 32. The pump 3| has an extended shaft33 rotatively supported in brackets '34, extending from the slide 20. Abevel gear 35 is mounted upon the extended end of the shaft 33 andmeshes with a complementary bevel gear 36. Thebevel' gear 36 is mountedon the driven shaft 23 of the gasoline engine 22 for the purpose ofdriving the shaft 33 to operate the pump 3I when the saw 21 is rotated.

The pump 3| hasextended pipe lines which pass to a valve 5| mounted uponthe side arm of the frame I0 adjacent one of the handles I2. The valve51 is provided with a controllable knob 52 More specifically, thecorners of the

